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Thermodynamics: An Engineering Approach | 8th Edition | ISBN: 9780073398174 | Authors: Yunus A. Cengel
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Solved: A well-insulated valve is used to throttle steam

Chapter 5, Problem 565

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QUESTION:

A well-insulated valve is used to throttle steam from 8 MPa and 3508C to 2 MPa. Determine the final temperature of the steam.

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QUESTION:

A well-insulated valve is used to throttle steam from 8 MPa and 3508C to 2 MPa. Determine the final temperature of the steam.

ANSWER:

Step 1 of 3

Steam is throttled by a well-insulated valve. The temperature drop of the steam after the expansion is to be determined.

Assumptions are

1. This is a steady-flow process since there is no change with time.

2. Kinetic and potential energy changes are negligible.

3. Heat transfer to or from the fluid is negligible.

4. There are no work interactions involved.

The inlet enthalpy of steam is (Tables A-6)

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